Sommaire

  • Cet exposé a été présenté le 14 décembre 2018.

Description

  • Orateur

    Joël Cathebras

Le chiffrement homomorphe est un outil cryptographique permettant la manipulation de données en aveugle. Son utilisation généralisée permettrait de proposer des solutions de calcul déporté impliquant des données confidentielles, par exemple des données génomiques pour la médecine personnalisée. Cependant, le chiffrement homomorphe doit faire face à de grandes complexités mémoires et calculatoires. La taille d’une donnée chiffrée est environ 10^5 fois plus importante que la donnée réelle, et une opération sur chiffré est environ 10^6 fois plus lourde que l’opération claire équivalente. Dans cet exposé, nous présenterons d’abord succinctement les problématiques d’accélération matérielle pour le chiffrement homomorphe et les différentes approches existantes. Nous exposerons ensuite plus particulièrement une approche couplant le système de représentation non-positionnel RNS et la multiplication de polynômes par transformée de Fourier sur corps-finis (NTT). Nous nous intéresserons notamment à la question du passage à l’échelle au regard de la grande dynamique des paramètres. Les perspectives d’implémentation apportées par cette approche viendront conclure cet exposé.

Infos pratiques

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